Thomas Ristenpart Scott Yilek The Power of Proofs-of-Possession: Securing Multiparty Signatures against Rogue-Key Attacks. 228-245 2007 conf/eurocrypt/2007 EUROCRYPT http://dx.doi.org/10.1007/978-3-540-72540-4_13 db/conf/eurocrypt/eurocrypt2007.html#RistenpartY07